Selective acetylation of 20-hydroxyecdysone partial synthesis of some minor ecdysteroids and analogues
作者:Apichart Suksamrarn、Prasert Pattanaprateep
DOI:10.1016/0040-4020(95)00635-l
日期:1995.9
Selective acetylation of the 2:3- and 20:22-acetonide and 2:3:20,22-diacetonide derivatives of 20-hydroxyecdysone and subsequent removal of the protecting groups led to partial synthesis of a number of mono-, di- and triacetate derivatives of 20-hydroxyecdysone. Some of these acetate derivatives are minor, naturally occurring ecdysteroids.
Immobilized Candida antarctica lipase B (Novozym 435) catalyzes the regioselective acylation of 20R-hydroxyecdysone (1a) and its congeners 2a, 3a and 4a at the C-2 OH in high yield and purity. (C) 1997 Elsevier Science Ltd.
Studies on Constituents of Fruit Body of Polyporus umbellatus and Their Cytotoxic Activity.
作者:Takatomi OHSAWA、Masae YUKAWA、Chusei TAKAO、Mitsuo MURAYAMA、Hideo BANDO
DOI:10.1248/cpb.40.143
日期:——
From the crude drug Chorei, the fruit body of Polyporus umbellatus, seven new components named polyporusterone A, B, C, D, E, F and G, were isolated and their structures were determined on the basis of the spectral data. These compounds showed cytotoxic action on leukemia 1210 cell proliferation.
Natural product derivatives as food supplements and pharmaceuticals
申请人:Amato K. Daniel
公开号:US20050191385A1
公开(公告)日:2005-09-01
Then present invention provides new and useful derivatives of phyto-derived tetracyclic compounds possessing steroidal-like activity, and in some instances both amino acid/oligo-peptide and steroidal-like activity, uses thereof and methods of production.